A transceiver includes: a first transforming network arranged for using a first input impedance to receive a first modulated signal and using a first output impedance to output a first transformed signal during a transmitting mode of a first communication standard, and for using the first input impedance to receive a second modulated signal and using a second output impedance to output a second transformed signal during the transmitting mode of a second communication standard; a second transforming network arranged for using a second input impedance to receive the second transformed signal and using a third output impedance to output a first RF signal to a connecting port of the transceiver during the transmitting mode of the second communication standard; a power amplifier, arranged to generate a second RF signal; and a switching circuit for selectively coupling the second transformed signal to the second transforming network.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A transceiver, comprising: a first transforming network, having a first input impedance, a first output impedance, and a second output impedance, arranged for using the first input impedance to receive a first modulated signal and using the first output impedance to output a first transformed signal during a transmitting mode of a first communication standard, and for using the first input impedance to receive a second modulated signal and using the second output impedance to output a second transformed signal during the transmitting mode of a second communication standard; a second transforming network, having a second input impedance and a third output impedance, arranged for using the second input impedance to receive the second transformed signal and using the third output impedance to output a first RF signal to a connecting port of the transceiver during the transmitting mode of the second communication standard; a power amplifier, arranged to generate a second RF (Radio frequency) signal to the connecting port of the transceiver according to the first transformed signal during the transmitting mode of the first communication standard; and a switching circuit, coupled between the first transforming network and the second transforming network, for coupling the second transformed signal to the second transforming network during the transmitting mode of the second communication standard, and not coupling the second transformed signal to the second transforming network during the transmitting mode of the first communication standard.
2. The transceiver of claim 1 , wherein the power amplifier is turned off during the transmitting mode of the second communication standard.
3. The transceiver of claim 1 , wherein the first transforming network comprises: a primary windings, arranged to receive the first modulated signal during the transmitting mode of the first communication standard, and receive the second modulated signal during the transmitting mode of the second communication standard; and a secondary windings, magnetically coupled to the primary windings, arranged to generate the first transformed signal on a first output terminal of the secondary windings during the transmitting mode of the first communication standard, and generate the second transformed signal on a second output terminal of the secondary windings during the transmitting mode of the second communication standard.
4. The transceiver of claim 1 , wherein the first transforming network comprises: a primary windings, arranged to receive the first modulated signal during the transmitting mode of the first communication standard, and receive the second modulated signal during the transmitting mode of the second communication standard; a first secondary windings, magnetically coupled to the primary windings, arranged to generate the first transformed signal on an output terminal of the first secondary windings during the transmitting mode of the first communication standard; and a second secondary windings, magnetically coupled to the primary windings, arranged to generate the second transformed signal on an output terminal of the second secondary windings during the transmitting mode of the second communication standard.
5. The transceiver of claim 1 , further comprising: a mixing circuit, arranged to generate the first modulated signal according to a first input signal during the transmitting mode of the first communication standard and generate the second modulated signal according to a second input signal during the transmitting mode of the second communication standard.
6. The transceiver of claim 1 , wherein during the transmitting mode of the first communication standard, if an output power of the first transformed signal is lower than a predetermined power level, then the first transforming network is arranged to use the first input impedance to receive the first modulated signal and to use the second output impedance to output a third transformed signal to the second transforming network for transforming the third transformed signal to the connecting port, and the power amplifier is power-off.
7. The transceiver of claim 1 , wherein during the transmitting mode of the second communication standard, if an output power of the second transformed signal is higher than a predetermined power level, then the first transforming network is arranged to use the first input impedance to receive the second modulated signal and to use the first output impedance to output a fourth transformed signal to the power amplifier for amplifying the fourth transformed signal to the connecting port, and the switching circuit is opened.
8. The transceiver of claim 1 , wherein the second transforming network is further arranged to transform a third RF signal received on the connecting port into a third transformed signal during a receiving mode of the first communication standard, and transform a fourth RF signal received on the connecting port into a fourth transformed signal during the receiving mode of the second communication standard.
9. The transceiver of claim 8 , wherein the power amplifier is powered off during the receiving mode of the first communication standard and the receiving mode of the second communication standard.
10. The transceiver of claim 8 , further comprising: a low-noise amplifying circuit, arranged to receive the third transformed signal to generate a first low-noise signal during the receiving mode of the first communication standard, and receive the fourth transformed signal to generate a second low-noise signal during the receiving mode of the second communication standard; and a mixing circuit, arranged to generate a third modulated signal according to the first low-noise signal during the receiving mode of the first communication standard and generate a fourth modulated signal according to the second low-noise signal during the receiving mode of the second communication standard.
11. The transceiver of claim 10 , wherein at least one of the low-noise amplifying circuit and the mixing circuit is powered off during the transmitting mode of the first communication standard and the transmitting mode of the second communication standard.
12. The transceiver of claim 8 , wherein the switching circuit is arranged to not couple the first transforming network to the second transforming network during the receiving mode of the first communication standard and the receiving mode of the second communication standard.
13. A transceiver, comprising: a first transforming network, arranged to transform a first modulated signal into a first transformed signal according to a first winding turns ratio during a transmitting mode of a first communication standard, and transform a second modulated signal into a second transformed signal according to a second winding turns ratio during the transmitting mode of a second communication standard; a power amplifier, arranged to generate a first RF (Radio frequency) signal to a connecting port of the transceiver according to the first transformed signal during the transmitting mode of the first communication standard; and a switching circuit, coupled between the first transforming network and the connecting port, for coupling the second transformed signal to the connecting port during the transmitting mode of the second communication standard, and not coupling the second transformed signal to the connecting port during the transmitting mode of the first communication standard.
14. The transceiver of claim 13 , wherein the first winding turns ratio is larger than the second winding turns ratio.
15. The transceiver of claim 13 , wherein the first transforming network comprises: a primary windings, arranged to receive the first modulated signal during the transmitting mode of the first communication standard, and receive the second modulated signal during the transmitting mode of the second communication standard; and a secondary windings, magnetically coupled to the primary windings, arranged to generate the first transformed signal on a first output terminal of the secondary windings during the transmitting mode of the first communication standard, and generate the second transformed signal on a second output terminal of the secondary windings during the transmitting mode of the second communication standard.
16. The transceiver of claim 13 , wherein the first transforming network comprises: a primary windings, arranged to receive the first modulated signal during the transmitting mode of the first communication standard, and receive the second modulated signal during the transmitting mode of the second communication standard; a first secondary windings, magnetically coupled to the primary windings, arranged to generate the first transformed signal on an output terminal of the first secondary windings during the transmitting mode of the first communication standard; and a second secondary windings, magnetically coupled to the primary windings, arranged to generate the second transformed signal on an output terminal of the second secondary windings during the transmitting mode of the second communication standard.
17. The transceiver of claim 13 , further comprising: a second transforming network, coupled between the switching circuit and the connecting port, for transforming the second transformed signal into a second RF signal on the connecting port during the transmitting mode of the second communication standard.
18. The transceiver of claim 17 , wherein the second transforming network is further arranged to transform a third RF signal received on the connecting port into a third transformed signal during a receiving mode of the first communication standard, and transform a fourth RF signal received on the connecting port into a fourth transformed signal during the receiving mode of the second communication standard.
19. The transceiver of claim 18 , wherein the switching circuit is arranged to not couple the first transforming network to the second transforming network during the receiving mode of the first communication standard and the receiving mode of the second communication standard.
20. A method of controlling a transceiver, the method comprising: when the transceiver operates under a first communication standard: using a first transforming network to transform a first modulated signal into a first transformed signal according to a first winding turns ratio during a transmitting mode; and using a power amplifier to generate a first RF (Radio frequency) signal to a connecting port of the transceiver according to the first transformed signal during the transmitting mode; and when the transceiver operates under a second communication standard: using the first transforming network to transform a second modulated signal into a second transformed signal according to a second winding turns ratio during the transmitting mode; and coupling the second transformed signal to the connecting port during the transmitting mode; wherein the second transformed signal is not coupled to the connecting port during the transmitting mode of the first communication standard.
21. The method of claim 20 , wherein the first winding turns ratio is larger than the second winding turns ratio.
22. The method of claim 20 , further comprising: using a second transforming network to transform the second transformed signal into a second RF signal on the connecting port during the transmitting mode of the second communication standard.
23. The method of claim 22 , further comprising: using the second transforming network to transform a third RF signal received on the connecting port into a third transformed signal during a receiving mode of the first communication standard; and using the second transforming network to transform a fourth RF signal received on the connecting port into a fourth transformed signal during the receiving mode of the second communication standard.
24. The method of claim 22 , further comprising: not coupling the first transforming network to the second transforming network during the receiving mode of the first communication standard and the receiving mode of the second communication standard.
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December 31, 2013
August 4, 2015
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